Warning, /webapps/qmlonline/qml/examples/sequentialanimation.qml is written in an unsupported language. File is not indexed.

 import QtQuick 2.7
 import QtQuick.Controls 2.3
 
 Rectangle {
     id: root
     color: "red"
     anchors.fill: parent
 
     Rectangle {
         color: "black"
         anchors.centerIn: parent
         width: 100
         height: width
 
         SequentialAnimation on width {
             loops: Animation.Infinite
             PropertyAnimation { to: root.width/2; duration: 800 }
             PropertyAnimation { to: root.width/4; duration: 300 }
         }
     }
 }